Abstract
The degradation behavior against a surge-current in the ZPCCYE (ZnO–Pr6O11–CoO–Cr2O3–Y2O3–Er2O3) varistors was investigated for different amounts of Er2O3. The addition of Er2O3 has a significant effect on nonlinear electrical properties and surge degradation behavior of the ZPCCYE varistors. Increasing amount of Er2O3 improved the clamp characteristics, in which the clamping voltage (K) decreases at a surge-current of 1–40A. The varistors added with 0.5mol% Er2O3 exhibited the strongest electrical stability, with the variation rate of the breakdown field of −3.2%, the variation rate of the nonlinear coefficient of −20.9%, and the variation rate of the leakage current of −40.0% after applying 1000 times for a surge-current of 100A/cm2. Furthermore, the varistors added with 0.5mol% Er2O3 exhibited the good surge withstand capability with the variation rate of the breakdown field of −7.9% after applying the surge-current of 400A. On the contrary, the varistors added with 0.25mol% were destroyed after applying the surge-current of 400A and the varistors added with 1.0mol% were destroyed after applying 55 times for a surge-current of 100A/cm2.
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